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Name of product: Yamaha Raptor YFM660R ATVs.

Units: About 86,000.

Manufacturer/distributor: Yamaha Motor Corporation, U.S.A. of Cypress, Calif.

Hazard: In February 2004, Yamaha announced a voluntary recall of Raptor YFM660R ATVs. Vibration from the engine and driveline during long periods of high rpm usage could cause the rear master cylinder reservoir to agitate resulting in brake fluid aeration. A small amount of air bubbles could enter the master cylinder adversely affecting rear brake performance.

Incidents/Injuries: Yamaha received eight reports of incidents that may be attributed to rear brake fluid aeration. There are four reports of minor injuries.

Description: Model year 2001-2004 Raptor YFM660R ATVs are involved in this recall. The 2001 to 2004 model year ATVs have 660R written on both sides of the bodywork and Raptor written on both sides of the rear fender. The 2001 and 2002 ATVs are either blue and white or black and white; the 2003 ATVs are either blue and white, black and red, or black with blue flame graphics; and the 2004 ATVs are either blue and white or red and white.

Sold at: Yamaha dealers sold these ATVs nationwide between 2000 and 2004 for between $6,199 and $6,699.

Manufactured in: Japan.

Remedy: Free repair. Registered owners of the affected units were notified directly by mail sent on Feb. 27, 2004 . Consumers who have not already responded to the recall should stop using their ATV immediately and contact an authorized Yamaha dealer to schedule an appointment for repair.

Consumer contact: (800) 227-5963 from 8 a.m. to 6 p.m. everyday, or log on to